Flying wing down top rudder to lose altitude in delebirately out of balanced flight while on an instrument scan due to ... what reason, bear? I am working from "pilots trying to fly the bloody iron" and forwards in my thinking here, not "working backwards from the iron hitting the sea" perspective.
You can descend in balanced flight using power and pitch, yes?
bear, I appreciate the allusion you make, but it doesn't strike me as that good of an idea in IMC/Tstorm conditions at night. Absent airspeed indication, and with the info I've gleaned from this thread and that other one, the attitude reference system would still indicate wing and pitch information. Set an attitude, power, and then determine if you like how fast your altitude is changing. Adjust as needed to retain a comfortable descent rate, adjusted for the odd up draft and down draft you are subject to whilst in the Tstorm ...